Hi,

This seems to work, UTSL saves the day

#!/usr/bin/perl --
use strict;
use warnings;
use Tk;
use Tk::BrowseEntry;
{
    my $mw = tkinit();
    my $var = 'initial label';
    my $b = $mw->BrowseEntry(-label => "Label", -variable => \$var);
    $b->insert("end", "opt1");
    $b->insert("end", "opt2");
    $b->insert("end", "opt3");
    $b->pack;
    WheelsUp($b );
    $mw->focusFollowsMouse;
    MainLoop;
}
sub WheelsUp {
    my( $b ) = @_;
    my $mw = $b->toplevel;
    for my $wi ( $b, map { $_, $_->children } $b->children  ){
        $mw->bind( $wi, '<MouseWheel>',[ \&wheel_browse, $b, Tk::Ev('D
+')]);
        $mw->bind( $wi, '<4>',[ \&wheel_browse ,  $b, 120]);
        $mw->bind( $wi, '<5>',[ \&wheel_browse ,  $b, -120]);
        $mw->bind( $wi, '<Up>',[ \&wheel_browse ,  $b, 1]);
        $mw->bind( $wi, '<Down>',[ \&wheel_browse ,  $b, -1]);
    }
}
sub wheel_browse  {
    my( $main, $bro, $num ) = @_;
    my $lb = $bro->Subwidget("slistbox")->Subwidget('listbox');
    $num  =  $num < 0 ? -1 : 1; 
    $lb->UpDown( $num );
    my $var_ref = $bro->cget( '-textvariable' );
    $$var_ref = $lb->getSelected; 
    return;
}
__END__
[download]

Yes, it does work indeed, thank you very much!!

I had spent hours on this previously getting nowhere, you clearly are a Perl genius!